Jesse Shared "IMSK Exam 3" - 18 Picmonics

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IMSK Exam 3

Myasthenia Gravis
Mechanism
Antibodies to Acetylcholine Receptor
Symptoms
Ptosis
Diplopia
Weakness with Muscle Use
Respiratory Death
Thymus Associated
Treatment
Acetylcholinesterase Inhibitors
Plasmapheresis
Thymectomy
1 min
Lambert-Eaton Syndrome
Mechanism
Autoantibody to the Presynaptic Calcium Channel on Motor Neurons
Inhibits Acetylcholine (ACh) Release at Neuromuscular Junction
Paraneoplastic Syndrome
Small Cell Lung Cancer
Symptoms
Proximal Muscle Weakness
Improves with Muscle Use
Autonomic Symptoms
Extraocular Muscle Sparing
2 mins
Hypersensitivity Type I
Previous Antigen Exposure
Immediate Reaction
IgE Cross-linking
Presensitized Mast Cells
Histamine Release
Vasodilation
Anaphylaxis
Allergies
Treatment
Epinephrine
1 min
Hypersensitivity Type II
Cytotoxic
IgM or IgG antibody-mediated
Membrane Attack Complex (MAC)
Mechanism
Opsonization
Complement Activation
NK Cells
Testing
Direct Coombs test
Indirect Coombs Test
1 min
Hypersensitivity Type III
Immune Complex
Antigen-antibody (IgG) complex activates complement
Neutrophils release lysozomal enzymes
Examples
Arthus Reaction
Serum Sickness
Systemic Lupus Erythematosus (SLE)
1 min
Hypersensitivity Type IV
Delayed-Type Hypersensitivity
T Cell Mediated
Antibody Independant
Macrophages Activated
Examples
Transplant Rejection
PPD Skin Test
Contact Dermatitis
1 min
Pemphigus Vulgaris
Pathophysiology
Autoantibodies against desmosomes
Symptoms
Flaccid Bullae on Skin
Oral Mucosa Involvement
Intraepidermal Acantholysis
Fluid Loss
Infection
Nikolsky Positive
Diagnosis
Biopsy showing Autoantibodies
Treatment
IVIG and Plasmapheresis
Oral Steroids
Immunosuppressants
2 mins
Muscular Dystrophy
Mechanism
X-linked Recessive
Signs and Symptoms
Muscle Weakness
Motor Problems
Gower Sign
Large Calves
Waddling Gait
Loss of Ambulation
Consideration
Cardiac and Respiratory Failure
2 mins
McArdles Disease
Pathophysiology
Type V Glycogen Storage Disease
Muscle Glycogen Phosphorylase Deficiency
Signs and Symptoms
Increased Glycogen in Muscle
Painful Muscle Cramps
Myoglobinuria
Normal Lactic Acid
Treatment
Vitamin B6
2 mins
Achondroplasia
Mechanism
Autosomal Dominant
Advanced Paternal Age
Most Common Cause of Dwarfism
Mutation of FGFR3 (Fibroblast Growth Factor Receptor 3)
Defective Endochondral Ossification
Symptoms
Delayed Motor Milestones
Shortened Limbs with Normal Axial Skeleton Size
May Develop Hydrocephalus
Symptoms of Spinal Stenosis
Normal Life Span and Fertility
2 mins
Osteogenesis Imperfecta
Pathophysiology
Autosomal Dominant
Decreased Type I Collagen Production
Symptoms
Phenotypically Diverse
Brittle Bone Disease
Fractures from Minimal Trauma
Confused with Child Abuse
Hearing Loss
Dental Imperfections
Blue Sclera
1 min
Osteopetrosis (Marble Bone Disease)
Pathophysiology
Defective Osteoclast Resorption
Carbonic Anhydrase II Mutation
Lack of Acidic Environment
Symptoms
Fractures
Nerve Palsies
Diagnosis
Myelophthisic Anemia
Erlenmeyer Flask Bones
Normal ALP and PTH
Normal Calcium and Phosphorus
Bone-in-bone Appearance
Treatment
Bone Marrow Transplant
2 mins
Paget's Disease of Bone
Pathophysiology
Men > Age 40
Increased Osteoblast and Osteoclast activity
Mosaic Pattern
Signs and Symptoms
Increased Skull Diameter
Hearing Loss
Fractures
Bone Ache and Joint Pain
High Output Heart Failure
Diagnosis
Bone Scan
Normal Parathyroid hormone (PTH) and Calcium
Elevated ALP
Treatment
Bisphosphonate
Calcitonin
2 mins
Vitamin D Deficiency
Signs & Symptoms
Rickets in children
Bending bones
Rachitic rosary
Breast milk has decreased vitamin D
Osteomalacia in adults
Tetany from Hypocalcemia
1 min
Osteosarcoma
Pathophysiology
Osteogenic Sarcoma
Peak incidence men 10-20 years old
Metaphysis of Long Bones
Knee Region
Radiation
Familial Retinoblastoma
Paget's Disease
Diagnosis
Codman Triangle
Sunburst Pattern from Elevated Periosteum
Grave Prognosis
2 mins
Ewing's Sarcoma
Epidemiology
Most Common in Boys < 15 years old
Pathophysiology
11;22 Translocation
Characteristics
Long bones, Pelvis, Ribs
Diaphysis
Small Blue Cells
Malignant
Aggressive
Onion-skin Appearance
TREATMENT
Responsive to Chemotherapy
2 mins
Osteoarthritis
Mechanism
Articular Cartilage Destruction
Biomechanical Stress
Aging
Signs and Symptoms
Asymmetric
Pain Decreases with Rest
Morning Stiffness Under 30 Minutes
Crepitus
DIP and PIP Joints
Treatment
Lifestyle Changes
Acetaminophen or NSAIDs
1 min
Dermatomes - Lumbosacral
L2 - Medial Thigh
L3 - Medial Knee
L4 - Kneecap, Medial Ankle and Big Toe
L5 - Dorsum of Foot
S1 - Lateral Foot, Posteriolateral Thigh
S 2, 3, 4, 5 - Perianal and Genitals
2 mins

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